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2.1.3
Phase Overcurrent (50, 51)
Voltage Inputs:
Current Inputs:
Disable:
Map Pickup LED:
Other protection functions may overlap with these functions during testing, it may be useful to disable some
functions to avoid ambiguity.
These elements can be allocated to W1 or W2 current inputs by relay settings, ensure that current is injected on
the correct input.
Particular care should be taken when testing overcurrent functions that the thermal rating of the current inputs is
not exceeded.
©2010 Siemens Protection Devices Limited
7SR242 Duobias Commissioning & Maintenance Guide
Figure 2-3
Phase Overcurrent
None
W1-I
(I
), W1-I
(I
), W1-I
L1
A
L2
B
L3
46, 49, 50BF, 87BD, 87HS
51-n/50-n - Self Reset
(I
), or W2-I
(I
), W2-I
(I
), W2-I
C
L1
A
L2
B
Chapter 6 Page 18 of 57
(I
),
L3
C
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